Three-dimension pantograph engraving-machine.



m. 684,972. Patented Oct. 22, mm. m. BARB.

THREE DIMENSION PANTOGRAPl-l ENGRAVING MACHINE.

(Application filed Aug. 6, 1900.)

3 Sheets-Sheet I.

(No Model.)

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No. 684,972. Patented Odt. 22,1901.

I m. BARB. THREE DIMENSION PANTOGRAPH ENGRAVING MACHINE.

(Application filed Aug. 6, 1900.)

3 Sheets-*Sheet 2.

(No Model.)

JQWW.

M. BARR.

' THREE DIMENSION PANTOGRAPH' ENGBAVING MACHINE.

Patented Oct. 22, [90L (Application filed Aug. 6, 1900.)

- 3 Sheets-Sheet 3.

(No Model UNITE STATES PATENT OFFICE.

MARK BARR, OF BROADHEATH, ENGLAND, ASSIGNOR TO THE LINOTYPE COMPANY,LIMITED, OF LONDON, ENGLAND.

THREE-DIMENSION PANTOGRAPH ENGRAVlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 684,972, dated October22, 1901.

' Application filed August 6, 1900. Serial No. 26,073. (No model.)

To all whom it may concern:

Be it known that I, MARK BARR, of Broadheath, in the county ofOhester,England, have invented certain new and useful Improvements inThree-Dimension Pantograph Engraving-Machines; and I do hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

The present invention relates to improvements in three dimensionpantograph engraving-machines. An engraving-machine that can deal onlywith a plane surface in both pattern and work has a two-dimensioncapacity-that is, it can deal with length and breadth; but an engravingmachine the tracer-rod and tool of-which have each a capacity forvertical motion such as would be required in engraving the intaglio orthe cameo contours of a'medal has a third-dimension capacity; hence theterm three-dimension engraving-machine.

Referring to the accompanying figures, which are to be taken as part ofthis specifi cation and read therewith, Figure 1 is a plan, and Fig. 2 afront elevation, illustratingthe present invention. Fig. 3 is a plan,and Fig. 4 a front elevation, of a modified construction of the sameinvention. Fig.5 is a plan,

and Fig. 6 an end elevation from the right hand of Fig. 1, of amodification of the same invention. Fig. 7 is a plan, and Fig. 8 an endelevation, of a modification in the mechanism between the rocking rodand quill-tube illustrated in Figs. 1 and 2.

Referring to Figs. 1 and 2, 1 l l 1 represent the ordinarypantograph-linkage above mentioned.

2 is a supporting-pillar for one end of it. It also serves as the centerfor the linkage to turn about.

3 is the tracer-rod at the opposite end. This rod 3 has a capacity forvertical movement in either direction through a sleeve 4, carried by therespective end of the linkage 1. The top end of the rod 3 carries across-head 5, which engages in slots 6 6 in arms 7 7, springing to thefront from a boss 8 and at right angles therewith, as shown in Fig. 1.

9 is the quill of the engraving-tool.

10 is a bearing-block capable of turning freely about the axis of thequill 9, it being carried by the same member of the pantograph-linkage.

11 is a bearing carried by the bearingblock 10.

12 is a bearing carried by an arm 13, projecting outwardly of the boss 8and upwardly from the sleeve 4. The two bearings 11 and 12 and the boss8 are axially alined with each other on one side of the vertical planethat passes through the axes of the tracer-rod 3, the quill 9, and thepillar 2.

14 is a rod passed through the bearing 12, the boss 8, and the bearing11, all of which are bored to receive it with a working fit. 15 is alongitudinal slot in the said rod, and 16 is a spline fast to the boss 8and standing in the slot 15.

being prevented in the one direction by a crank-disk 17 and in the otherbya collar 18, both fast on the said rod, while the boss 8 and thebearing 12 are capable of sliding to and fro upon the rod 14.

48 is a diametrical slot in the outer face of the crank-disk 17, and 19is a pin the end of which engages in the said slot with a working fit.

20 is a cross-head carried by the tube 21, that carries the quill 9 inthe same way that the tracer-rod carries'its cross-head 5. Therespective ends of the cross-head 20 engage in slots 22 22 in arms 2323, springing to the rear from the rod 24, to which they are fast in thesame way that the arms 6 6 are fast to the boss 8. The rod 24 is capableof turning upon a pair of center screws 25 25, adjustable inscrew-threaded sockets 26 26, carried by the bearing-block 10.

27 is a lever fast by one end on the rod 24, from which it projects tothe rear at-right angles.

28 is a longitudinal slot in the said lever, through which the pin 19'is passedand held in the desired position along the length of theslotted portion of the lever by means of a collar 29, fast on the pin19, on one side of the lever 27 and a screw-threaded nut 30 on theother.

The opposite end of the rod 14 is capable of turning only about itsaxis. in the bearing 11, longitudinal motion therein.

The action of the invention constructed as above described is asfollows: Each rise and drop of the tracerrod 3 as the tracing-pointpasses up and down the intaglio and down and up the cameo contours ofthe pattern rocks the rod 14 in the bearings 11 12 accordingly. Therocking motion of the said rod is communicated to the lever 27 by thepin 19 and by the rod 24 and its arms 22 to the quill 9, so that therise and fall of the latter in the work 31 on the work-table 32corresponds exactly in time and proportionally with the rise and fall ofthe tracer-point above described. The ratio of reduction of the thirddimension is adjusted as may be desired by adjusting the position of thepin 19 along the slotted lever 27.

Figs. 1 and 2 show the pantograph-linkage 1 as communicating the lateralmovements of the tracer-rod 3 to the quill 9, while Figs. 3 and 4 showthe same pantograph-linkage 1 as communicating the lateral movements ofthe same tracer-rod 3 to the work-table 31, which is capable of motionin any lateral direction upon the base 32 by means of a pair of slides33 34 of the usual construction. The bracket-piece 10 is inverted andmade fast to the standard 35.

According to the modification illustrated in Figs. 5 and 6 theadjust-ability for ratio of reduction between pattern and work islocated at the tracer-rod end of the machine. The respective end of thepantograph-linkage 1 is connected to a block 36, adjustable along a pairof arms 37 37 by means of a pin 38, projecting from each side of thesaid block 36 and engaging in a slot 39 in the respective arm. Each pinis prolonged outside the respective arm 37 and is screw-threaded toreceive a nut 40, by means of which the block 36 is held securely in itsadjusted position. The opposite end of each arm 37 carries a socket 41,which slides on the respective end of the rod 14 to support it in thesame way as does the bracket 13 of Figs. 1 and 2. The tracer-rod 3slides up and down through the block 36, its cross-head 5 engaging inslots 6 6 in a pair of arms 7 7, springing from the boss 8. Thecross-head 20 of the quilltube 21 engages in slots 22 22 in arms 23 23,fast to the socket 42 on the respective end of the rod 14 to which it isfixed. The said end of the rod 14 turns in bearings 43 43, supported bythe respective end of the pantograph-linkage in substantially the sameway as the bearings 26 26 of Figs. 1 and 2.

The motion of the pin 19 in Figs. 1 and 2 is arcual. The modificationillustrated in Figs. 7 and 8 provides for it being vertical. The pin 19,that engages by its respective ends in the diametrical slot 48 in thecrank-disk 17, has a central square 44 on it, which it can ride up anddown a vertical slot 45 in a plate 46, which is carried in a fixed guide47, in which it is adjustable by a screw 50, turning withoutlongitudinal motion in a stationary bracket 49 and engaging in the plate46. The cross-head 20 engages by one end in a slot 22 in an arm 23 andby the other in the slot 28 in the lever 27. Both this arm 23 and thelever 27 are made fast to the piece 24. This combination of cross-head20, arm 23, and piece 24 pivot on a pair of center screws 25.

I claim- The combination of pantograph-linkage; tracer capable of avertical sliding motion through one end of it; rod adapted to rock inbearin gs carried by the respective ends of the said linkage; crossheadand slotted-arm con nection between the tracer-rod and the respectiveend of the rocking rod; and a connection adjustable for ratio ofreduction, be tween the quill-tube and the respective end of the rockingrod adapted to transfer the rocking motion of the said rod to the saidquill-tube converting it into a vertical one in so doing.

In testimony that I claim the foregoing as my invention I have signed myname in pres ence of two subscribing witnesses.

MARK BARR.

Witnesses:

ROBERT E. MCLAREN, CHAs. S. WooDnoFFE.

